Japan Swim 2015 - Day 6

The Asahi Shimbun

Winner Kosuke Hagino (L) and second place Daiya Seto react after competing in the Men's 400m Individual Medley final during day six of the Japan Swim 2015 at Tokyo Tatsumi International Swimming Center on April 12, 2015 in Tokyo, Japan.

Winner Kosuke Hagino (L) and second place Daiya Seto react after competing in the Men's 400m Individual Medley final during day six of the Japan Swim 2015 at Tokyo Tatsumi International Swimming Center on April 12, 2015 in Tokyo, Japan.

Japan Open - Day 3

The Asahi Shimbun

Winner Daiya Seto (L) of Japan smiles while third place Kosuke Hagino (R) of Japan reacts after the Men's 200m Individual Medley final during day three of the Japan Open 2015 at Tokyo Tasumi International Swimming Center on May 24, 2015 in Tokyo, Japan.

Winner Daiya Seto (L) of Japan smiles while third place Kosuke Hagino (R) of Japan reacts after the Men's 200m Individual Medley final during day three of the Japan Open 2015 at Tokyo Tasumi International Swimming Center on May 24, 2015 in Tokyo, Japan.

Japan Swim 2015 - Day 4

The Asahi Shimbun

Daiya Seto (front) reacts after winning the Men's 200m Butterfly final with second place Masato Sakai during day four of the Japan Swim 2015 at Tokyo Tatsumi International Swimming Center on April 10, 2015 in Tokyo, Japan.

Daiya Seto (front) reacts after winning the Men's 200m Butterfly final with second place Masato Sakai during day four of the Japan Swim 2015 at Tokyo Tatsumi International Swimming Center on April 10, 2015 in Tokyo, Japan.

2014 Pan Pacific Championships - Day 1

Chris Hyde

Daiya Seto of Japan holds the gold medal after winning the Men's 200m Butterfly final during day one of the 2014 Pan Pacific Championships at Gold Coast Aquatics on August 21, 2014 in Gold Coast, Australia.

Daiya Seto of Japan holds the gold medal after winning the Men's 200m Butterfly final during day one of the 2014 Pan Pacific Championships at Gold Coast Aquatics on August 21, 2014 in Gold Coast, Australia.

12th FINA World Swimming Championships (25m) - Day Two

Francois Nel

Daiya Seto of Japan celebrates on the podium after winning the Men's 400m Individual Medley Final during day two of the 12th FINA World Swimming Championships (25m) at the Hamad Aquatic Centre on December 4, 2014 in Doha, Qatar.

Daiya Seto of Japan celebrates on the podium after winning the Men's 400m Individual Medley Final during day two of the 12th FINA World Swimming Championships (25m) at the Hamad Aquatic Centre on December 4, 2014 in Doha, Qatar.

2014 Asian Games - Day 2

Brendon Thorne

Gold medalist (C) Daiya Seto of Japan, Silver medalist (L) Kenta Hirai of Japn and Bronze medalist (R) Joseph Isaac Schooling of Singapore pose atop the podium after the Men's 200m Butterfly Final during day two of the 2014 Asian Games at Munhak Park Tae-Hwan Aquatics Center on September 21, 2014 in Incheon, South Korea.

Gold medalist (C) Daiya Seto of Japan, Silver medalist (L) Kenta Hirai of Japn and Bronze medalist (R) Joseph Isaac Schooling of Singapore pose atop the podium after the Men's 200m Butterfly Final during day two of the 2014 Asian Games at Munhak Park Tae-Hwan Aquatics Center on September 21, 2014 in Incheon, South Korea.